choose correct alternative

If 49x – 57y = 172 and 57x – 49y = 252 then x – y = ……… ?

(A) 80 (B) 4 (C) 10 (D) 8

If 49x – 57y = 172 and 57x – 49y = 252 then x – y = ……… ?

(A) 80 (B) 4 (C) 10 (D) 8

choose correct alternative

If 49x – 57y = 172 and 57x – 49y = 252 then x – y = ……… ?

(A) 80 (B) 4 (C) 10 (D) 8

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Answer:(C) 10

Step-by-step explanation:57x – 49y = 252. Eqn 1

49x – 57y = 172 Eqn2

On subtracting Eqn 1 and 2 qe get

8x + 8y = 80 [divide by 8 on bothsides]

x + y =10